The initial model was the 737-100. It was launched in February 1965. The -100 was rolled out on January 17, 1967, had its first flight on April 9, 1967 and entered service with Lufthansa in February 1968. The aircraft is the smallest variant of the 737. A total of 30 737-100s were ordered and delivered; the final commercial delivery took place on October 31, 1969 to Malaysia–Singapore Airlines. No 737-100s remain in commercial service. The original Boeing prototype, last operated by NASA and retired more than 30 years after its maiden flight, is on exhibit in the Museum of Flight in Seattle.

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